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| author |   Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-03-30 17:15:05 +0900 |
|---|---|---|
| committer |   Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-04-25 14:18:38 +0200 |
| commit | 477544c62a84d3bacd9f90ba75ffc16c04d78071 (patch) | |
| tree | e9a1cdeaaa0862bd8d64483b14c0883357766a48 /include/linux/mtd/nand.h | |
| parent | mtd: nand: allocate aligned buffers if NAND_OWN_BUFFERS is unset (diff) | |
| download | linux-dev-477544c62a84d3bacd9f90ba75ffc16c04d78071.tar.xz linux-dev-477544c62a84d3bacd9f90ba75ffc16c04d78071.zip | |
mtd: nand: allow drivers to request minimum alignment for passed buffer
In some cases, nand_do_{read,write}_ops is passed with unaligned
ops->datbuf. Drivers using DMA will be unhappy about unaligned
buffer.
The new struct member, buf_align, represents the minimum alignment
the driver require for the buffer. If the buffer passed from the
upper MTD layer does not have enough alignment, nand_do_*_ops will
use bufpoi.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/mtd/nand.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 9e0c93c44bef..8f67b1581683 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -755,6 +755,7 @@ struct nand_manufacturer_ops { * setting the read-retry mode. Mostly needed for MLC NAND. * @ecc: [BOARDSPECIFIC] ECC control structure * @buffers: buffer structure for read/write + * @buf_align: minimum buffer alignment required by a platform * @hwcontrol: platform-specific hardware control structure * @erase: [REPLACEABLE] erase function * @scan_bbt: [REPLACEABLE] function to scan bad block table @@ -905,6 +906,7 @@ struct nand_chip { struct nand_ecc_ctrl ecc; struct nand_buffers *buffers; + unsigned long buf_align; struct nand_hw_control hwcontrol; uint8_t *bbt; |